package notwork;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class TcpEchoServer {

    private ServerSocket serverSocket=null;

    public TcpEchoServer(int port) throws IOException {
        this.serverSocket = new ServerSocket(port);
    }

    public void start() throws IOException {
        System.out.println("启动服务器");
        ExecutorService executorService= Executors.newCachedThreadPool();
        while(true){
            Socket clientSocket=serverSocket.accept();

            executorService.submit(()->{
               processConnection(clientSocket);
            });
        }

    }

    private void processConnection(Socket clientSocket) {
        System.out.printf("[%s:%d] 客户端上线!\n",clientSocket.getInetAddress(),clientSocket.getPort());
        try(InputStream inputStream=clientSocket.getInputStream();
            OutputStream outputStream=clientSocket.getOutputStream()){

            Scanner scanner=new Scanner(inputStream);
            PrintWriter writer=new PrintWriter(outputStream);

            while(true){
                if(!scanner.hasNext()){
                    System.out.printf("[%s:%d] 客户端下线！\n",clientSocket.getInetAddress(),clientSocket.getPort());
                    break;
                }
                String request= scanner.next();
                String reponse=process(request);
                writer.println(reponse);
                writer.flush();
                System.out.printf("[%s:%d] req:%s,resp:%s\n",clientSocket.getInetAddress()
                ,clientSocket.getPort(),request,reponse);
            }


        } catch (IOException e) {
            throw new RuntimeException(e);
        }finally {
            try {
                clientSocket.close();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
    }

    private String process(String request){
        return request;
    }

    public static void main(String[] args) throws IOException {
        TcpEchoServer server=new TcpEchoServer(5656);
        server.start();
    }

}
